Charm production and fragmentation fractions at midrapidity in pp collisions at $$ \sqrt{\textrm{s}} $$ = 13 TeV

Media type: E-Article

Title: Charm production and fragmentation fractions at midrapidity in pp collisions at $$ \sqrt{\textrm{s}} $$ = 13 TeV

Contributor: Acharya, S.; Adamová, D.; Aglieri Rinella, G.; Agnello, M.; Agrawal, N.; Ahammed, Z.; Ahmad, S.; Ahn, S. U.; Ahuja, I.; Akindinov, A.; Al-Turany, M.; Aleksandrov, D.; Alessandro, B.; Alfanda, H. M.; Alfaro Molina, R.; Ali, B.; Alici, A.; Alizadehvandchali, N.; Alkin, A.; Alme, J.; Alocco, G.; Alt, T.; Altamura, A. R.; Altsybeev, I.; [...]

Published: Springer Science and Business Media LLC, 2023

Language: English

DOI: 10.1007/jhep12(2023)086

ISSN: 1029-8479

Keywords: Nuclear and High Energy Physics

Origination:

Footnote:

Description: Abstract Measurements of the production cross sections of prompt D0, D+, D*+, $$ {\textrm{D}}_{\textrm{s}}^{+} $$ D s + , $$ {\Lambda}_{\textrm{c}}^{+} $$ Λ c + , and $$ {\Xi}_{\textrm{c}}^{+} $$ Ξ c + charm hadrons at midrapidity in proton-proton collisions at $$ \sqrt{s} $$ s = 13 TeV with the ALICE detector are presented. The D-meson cross sections as a function of transverse momentum (pT) are provided with improved precision and granularity. The ratios of pT-differential meson production cross sections based on this publication and on measurements at different rapidity and collision energy provide a constraint on gluon parton distribution functions at low values of Bjorken-x (10−5–10−4). The measurements of $$ {\Lambda}_{\textrm{c}}^{+} $$ Λ c + ($$ {\Xi}_{\textrm{c}}^{+} $$ Ξ c + ) baryon production extend the measured pT intervals down to pT = 0(3) GeV/c. These measurements are used to determine the charm-quark fragmentation fractions and the $$ \textrm{c}\overline{\textrm{c}} $$ c c ¯ production cross section at midrapidity (|y| < 0.5) based on the sum of the cross sections of the weakly-decaying ground-state charm hadrons D0, D+, $$ {\textrm{D}}_{\textrm{s}}^{+} $$ D s + , $$ {\Lambda}_{\textrm{c}}^{+} $$ Λ c + , $$ {\Xi}_{\textrm{c}}^0 $$ Ξ c 0 and, for the first time, $$ {\Xi}_{\textrm{c}}^{+} $$ Ξ c + , and of the strongly-decaying J/ψ mesons. The first measurements of $$ {\Xi}_{\textrm{c}}^{+} $$ Ξ c + and $$ {\Sigma}_{\textrm{c}}^{0,++} $$ Σ c 0 , + + fragmentation fractions at midrapidity are also reported. A significantly larger fraction of charm quarks hadronising to baryons is found compared to e+e− and ep collisions. The $$ \textrm{c}\overline{\textrm{c}} $$ c c ¯ production cross section at midrapidity is found to be at the upper bound of state-of-the-art perturbative QCD calculations.

Access State: Open Access

Search in field:

Recently searched for: